'01 v70 base, limp home, no codes, terrible rumble at start

[rickie]

Xemodex unit is $499 s/w installed so plug and play .... Sacer $469 and needs programming.

Or do you mean I can buy just the sensor itself (for about $100) and not the whole throttle body unit? The mechanic called and it is the ETM again. Now I'll have to decide which way to go from here...

[precopster]

Xemodex unit is $499 s/w installed so plug and play .... Sacer $469 and needs programming.
Or do you mean I can buy just the sensor itself (for about $100) and not the whole throttle body unit? The mechanic called and it is the ETM again. Now I'll have to decide which way to go from here...

Sacer make sensors for both Volvo and XeModex and they use them in their rebuilt ETMs OR you can buy a Sacer sensor from eBay.
Volvo use a new circuit board in their ETMs and use the old casing hence the requirement for programming. When Volvo get a botched Sacer sensor installation by an end user where the shaft has been shortened for the non-contacting sensor or one of XeModex's units as a return they have no choice other than to fit a non-contacting sensor otherwise they'll need to source a new magnet shaft which raises the cost. The rebuilt ETMs from Volvo are made in Italy. Are there any prizes for guessing which company was involved?

XeModex have knowledge of board level weaknesses in the circuitry and repair faulty boards when required. When you get an XeModex it's a used board (possibly your own, depending on which service you choose) with a non-contacting sensor attached.

Unfortunately not ALL Volvo rebuilt throttle bodies have the Sacer sensor. I got another one 2 weeks ago with Magnetti Marellis on both ends. Adding the Sacer adds cost so they use NEW Magnettis where the shaft hasn't been cut. ALL dealers require a core which go back to Italy.

[rickie]

thanks for all your input.... shop pulled 914F and 532D codes which they say is definitely etm .... no other codes popped up. talked to Xemodex today - very helpful but they are flummoxed and working with mechanic to figure it out. Will report back with what they find.... would loose wiring somewhere set off a code?... it's strange that it changes when going over bumps ...

[yellow-bat]

Vida says that any voltage fluctuation detected by the ETM (caused by a loose connection or broken or shorting wire in the Control Area Network(CAN)) will cause the ETM to signal the ECM to go into limp mode even though the fault might not be with the ETM or the ECM. I'm still working on locating my problem. Hope you fixed yours.

[rickie]

well, I'll skip the in between events/guesswork by one mechanic but the latest is that Xemodex called the shop right when the mechanic had gotten the car to repeat it's performance. They walked the mechanic thru what they wanted tested and agreed it was the ETM. The shop pulled the software codes off the ECU which told Xemodex that the car has s/w that is more rare - only about 1% of cars have it. So Xemodex felt that they needed to re-flash the ETM so it would talk w/ the ECU.

Since Volvo proper is so hard to deal w/ regarding s/w downloads none of the indies do it so the unit had to go back to Canada... Xemodex has been MOST helpful and spared no time or expense to fix this problem. I have nothing but good to say about their service!

I received the redone ETM today from Xemodex, took it to the shop for them to install. They did and drove it with apparently no issues as I didn't hear from them. I picked it up tonight after hrs, drove 4 mi, stopped at gas station and when I started it back up the 'engine management service required' light is on!!!! arghghghghghghg...... the shop had cleared the codes so here it is again!! wah wah wah

Driving the 4 mi it seemed to perform ok except that it had that kind of tell tale rumble that actually sounds like the exhaust is going.... which has always happened just prior to the thing going out entirely. I have no idea where to go from here.

Wouldn't there be a different code than ETM if there were some loose connection? I just don't understand why the only code is ETM.... aren't the code readers better than this?

[rickie]

yellow-bat, did you figure out your problem?

No one can figure out mine so far. So strange.... when all the codes say ETM but it isn't the module itself, what can it be? I'll research the CAN idea... do you have a link to wiring flow chart of it? Shop says ground on ETM is good (0.0), wiring to ECU is good...... has 4 mechanics stumped and I don't have thousands of $ to spend on a mechanic doing exploratory surgery.... could be days of testing and checking! Need to try what I can myself first...

[lrkramer]

I'm also getting a po121 code. I have the ETM sitting on my kitchen table. I applied 12volts going to the ETM (pins 5 & 6), but I dont know which set of wires is the potentiometer output to the ECM. Anybody know which pins is the output? thanks, larry

[precopster]

Last week we had a very intermittent ETM problem come through our workshop.

I was called to replace the ETM which I happily did with a tested used unit. (I also do a contactless rebuild service here in Australia however I often supply used units that have been running around in my car with no problems)

We later found that the same codes returned after ETM replacement. We first eliminated supply voltage by replacing the engine management relay however we also replaced ECM to see if the signal from ECM was telling the ETM to turn off.

Later the supply voltage (12V+) at the ETM connector totally disappeared then returned again and then finally left for good. We tried shaking the loom to make supply return however no amount of vibration brought it back.

We ended up rewiring the 12V supply to the ETM connector by going through a relay that was signalled by the injector rail voltage. We spent all day on this and the problem has finally gone away. Moral of the story is always recheck supply voltages. Now we have another happy customer

[a_e_cole]

I have the same v70 base. I got a recall notice a few years ago that there was a software problem that would cause the car in to limp mode for no reason. It never did it while I was driving thankfully. The dealer will reprogram all affected cars at no charge. In case some one is facing this problem Volvo customer care can tell you if it is affected and if it has be fixed.